Thanks for the kind words.
Flatheads typically need rebuilt after 8-10 nights of local racing, (more often if you are competing at the national level or money racing.) After 5 or 6 race days, 250 - 300 laps, the engine starts losing significant enough power to merit a rebuild. Local racers will typically stretch the engine maintenance out to 8 races or more (depending on your budget and how hard your turning the engine.) Most of thie power loss is in valve seal and ring seal. A simple freshen-up will bring the engine right back to where it was power-wise without costing an arm and a leg. Of course you can run it longer, but you really chance parts failure (specifically valve springs and retainers most of all.) It's good to keep up with rod bearings as well.
Now, if it's a small plate engine, I wouldn't be afraid to run it longer between rebuilds. My own son's purple plate engine had 15 nights on it and he won with it that night before I went through it and got everything back to within tolerances.
On the clutch, a Bully clutch rebuild is typically $100 or so, depending on the parts needed/wanted. Machinework & labor is $50, add a couple friction discs and you're good to go most times. If it needs a basket or any additional parts, of course that would be extra.
If you need anything, please feel free to give us a call.
Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Chassis
Vector Cuts
(25 years full time in the karting industry)
www.CarlsonMotorsports.com
215 N. High St.
Linden, IN 47955
765-339-4407
bcarlson@CarlsonMotorsports.com